REFERENCES
2. Melcon MO, Melcon CM, Bartoloni L, Cristiano E, Duran JC, Grzesiuk AK, Cabrera Gomez JA. Towards establishing MS prevalence in Latin America and the Caribbean. Mult Scler 2013;19:145-52.
3. Minden SL, Schiffer RB. Affective disorders in multiple sclerosis: review and recommendations for clinical research. Arch Neurol 1990;47:98-104.
4. Depression. Available from: www.nationalmssociety.org/depression. [Last accessed on 29 Mar 2018].
5. Koch MW, Patten S, Berzins S, Zhornitsky S, Greenfield J, Wall W, Metz LM. Depression in multiple sclerosis: a long term longitudinal study. Mult Scler J 2015;21:76-82.
6. Alhazzani AA, Alqahtani MS, Ogran H, Abuhawi OH, Asiri AY, Al-Hanash AM, AlQahtany RA, Alfaifi AA, Asiri AA, Asiri MA. Depression severity and its predictors among multiple sclerosis patients in Saudi Arabia: a cross-sectional study. Neuroimmunol Neuroinflammation 2018;5:8.
7. Bohlega S, Inshasi J, Tahan ARA, Madani AB, Qahtani H, Rieckmann P. Multiple sclerosis in the Arabian gulf countries: a consensus statement. J Neurol 2013;260:2963.
8. Alter M, Leiboweitz U, Speer J. Risk of multiple sclerosis related to age at immigration to Israel. Arch Neurol 1966;15:234-7.
